drivers/crypto/caam/qi.h - arm/linux - Git at Google

 /*
  * Public definitions for the CAAM/QI (Queue Interface) backend.
  *
  * Copyright 2013-2016 Freescale Semiconductor, Inc.
  * Copyright 2016-2017 NXP
  */

 #ifndef __QI_H__
 #define __QI_H__

 #include <soc/fsl/qman.h>
 #include "compat.h"
 #include "desc.h"
 #include "desc_constr.h"

 /*
  * CAAM hardware constructs a job descriptor which points to a shared descriptor
  * (as pointed by context_a of to-CAAM FQ).
  * When the job descriptor is executed by DECO, the whole job descriptor
  * together with shared descriptor gets loaded in DECO buffer, which is
  * 64 words (each 32-bit) long.
  *
  * The job descriptor constructed by CAAM hardware has the following layout:
  *
  *	HEADER		(1 word)
  *	Shdesc ptr	(1 or 2 words)
  *	SEQ_OUT_PTR	(1 word)
  *	Out ptr		(1 or 2 words)
  *	Out length	(1 word)
  *	SEQ_IN_PTR	(1 word)
  *	In ptr		(1 or 2 words)
  *	In length	(1 word)
  *
  * The shdesc ptr is used to fetch shared descriptor contents into DECO buffer.
  *
  * Apart from shdesc contents, the total number of words that get loaded in DECO
  * buffer are '8' or '11'. The remaining words in DECO buffer can be used for
  * storing shared descriptor.
  */
 #define MAX_SDLEN	((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN) / CAAM_CMD_SZ)

 /* Length of a single buffer in the QI driver memory cache */
 #define CAAM_QI_MEMCACHE_SIZE	768

 extern bool caam_congested __read_mostly;

 /*
  * This is the request structure the driver application should fill while
  * submitting a job to driver.
  */
 struct caam_drv_req;

 /*
  * caam_qi_cbk - application's callback function invoked by the driver when the
  *               request has been successfully processed.
  * @drv_req: original request that was submitted
  * @status: completion status of request (0 - success, non-zero - error code)
  */
 typedef void (*caam_qi_cbk)(struct caam_drv_req *drv_req, u32 status);

 enum optype {
 	ENCRYPT,
 	DECRYPT,
 	GIVENCRYPT,
 	NUM_OP
 };

 /**
  * caam_drv_ctx - CAAM/QI backend driver context
  *
  * The jobs are processed by the driver against a driver context.
  * With every cryptographic context, a driver context is attached.
  * The driver context contains data for private use by driver.
  * For the applications, this is an opaque structure.
  *
  * @prehdr: preheader placed before shrd desc
  * @sh_desc: shared descriptor
  * @context_a: shared descriptor dma address
  * @req_fq: to-CAAM request frame queue
  * @rsp_fq: from-CAAM response frame queue
  * @cpu: cpu on which to receive CAAM response
  * @op_type: operation type
  * @qidev: device pointer for CAAM/QI backend
  */
 struct caam_drv_ctx {
 	u32 prehdr[2];
 	u32 sh_desc[MAX_SDLEN];
 	dma_addr_t context_a;
 	struct qman_fq *req_fq;
 	struct qman_fq *rsp_fq;
 	int cpu;
 	enum optype op_type;
 	struct device *qidev;
 } ____cacheline_aligned;

 /**
  * caam_drv_req - The request structure the driver application should fill while
  *                submitting a job to driver.
  * @fd_sgt: QMan S/G pointing to output (fd_sgt[0]) and input (fd_sgt[1])
  *          buffers.
  * @cbk: callback function to invoke when job is completed
  * @app_ctx: arbitrary context attached with request by the application
  *
  * The fields mentioned below should not be used by application.
  * These are for private use by driver.
  *
  * @hdr__: linked list header to maintain list of outstanding requests to CAAM
  * @hwaddr: DMA address for the S/G table.
  */
 struct caam_drv_req {
 	struct qm_sg_entry fd_sgt[2];
 	struct caam_drv_ctx *drv_ctx;
 	caam_qi_cbk cbk;
 	void *app_ctx;
 } ____cacheline_aligned;

 /**
  * caam_drv_ctx_init - Initialise a CAAM/QI driver context
  *
  * A CAAM/QI driver context must be attached with each cryptographic context.
  * This function allocates memory for CAAM/QI context and returns a handle to
  * the application. This handle must be submitted along with each enqueue
  * request to the driver by the application.
  *
  * @cpu: CPU where the application prefers to the driver to receive CAAM
  *       responses. The request completion callback would be issued from this
  *       CPU.
  * @sh_desc: shared descriptor pointer to be attached with CAAM/QI driver
  *           context.
  *
  * Returns a driver context on success or negative error code on failure.
  */
 struct caam_drv_ctx *caam_drv_ctx_init(struct device *qidev, int *cpu,
 				       u32 *sh_desc);

 /**
  * caam_qi_enqueue - Submit a request to QI backend driver.
  *
  * The request structure must be properly filled as described above.
  *
  * @qidev: device pointer for QI backend
  * @req: CAAM QI request structure
  *
  * Returns 0 on success or negative error code on failure.
  */
 int caam_qi_enqueue(struct device *qidev, struct caam_drv_req *req);

 /**
  * caam_drv_ctx_busy - Check if there are too many jobs pending with CAAM
  *		       or too many CAAM responses are pending to be processed.
  * @drv_ctx: driver context for which job is to be submitted
  *
  * Returns caam congestion status 'true/false'
  */
 bool caam_drv_ctx_busy(struct caam_drv_ctx *drv_ctx);

 /**
  * caam_drv_ctx_update - Update QI driver context
  *
  * Invoked when shared descriptor is required to be change in driver context.
  *
  * @drv_ctx: driver context to be updated
  * @sh_desc: new shared descriptor pointer to be updated in QI driver context
  *
  * Returns 0 on success or negative error code on failure.
  */
 int caam_drv_ctx_update(struct caam_drv_ctx *drv_ctx, u32 *sh_desc);

 /**
  * caam_drv_ctx_rel - Release a QI driver context
  * @drv_ctx: context to be released
  */
 void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx);

 int caam_qi_init(struct platform_device *pdev);
 int caam_qi_shutdown(struct device *dev);

 /**
  * qi_cache_alloc - Allocate buffers from CAAM-QI cache
  *
  * Invoked when a user of the CAAM-QI (i.e. caamalg-qi) needs data which has
  * to be allocated on the hotpath. Instead of using malloc, one can use the
  * services of the CAAM QI memory cache (backed by kmem_cache). The buffers
  * will have a size of 256B, which is sufficient for hosting 16 SG entries.
  *
  * @flags: flags that would be used for the equivalent malloc(..) call
  *
  * Returns a pointer to a retrieved buffer on success or NULL on failure.
  */
 void *qi_cache_alloc(gfp_t flags);

 /**
  * qi_cache_free - Frees buffers allocated from CAAM-QI cache
  *
  * Invoked when a user of the CAAM-QI (i.e. caamalg-qi) no longer needs
  * the buffer previously allocated by a qi_cache_alloc call.
  * No checking is being done, the call is a passthrough call to
  * kmem_cache_free(...)
  *
  * @obj: object previously allocated using qi_cache_alloc()
  */
 void qi_cache_free(void *obj);

 #endif /* __QI_H__ */
	/*
	* Public definitions for the CAAM/QI (Queue Interface) backend.
	*
	* Copyright 2013-2016 Freescale Semiconductor, Inc.
	* Copyright 2016-2017 NXP
	*/

	#ifndef __QI_H__
	#define __QI_H__

	#include <soc/fsl/qman.h>
	#include "compat.h"
	#include "desc.h"
	#include "desc_constr.h"

	/*
	* CAAM hardware constructs a job descriptor which points to a shared descriptor
	* (as pointed by context_a of to-CAAM FQ).
	* When the job descriptor is executed by DECO, the whole job descriptor
	* together with shared descriptor gets loaded in DECO buffer, which is
	* 64 words (each 32-bit) long.
	*
	* The job descriptor constructed by CAAM hardware has the following layout:
	*
	* HEADER (1 word)
	* Shdesc ptr (1 or 2 words)
	* SEQ_OUT_PTR (1 word)
	* Out ptr (1 or 2 words)
	* Out length (1 word)
	* SEQ_IN_PTR (1 word)
	* In ptr (1 or 2 words)
	* In length (1 word)
	*
	* The shdesc ptr is used to fetch shared descriptor contents into DECO buffer.
	*
	* Apart from shdesc contents, the total number of words that get loaded in DECO
	* buffer are '8' or '11'. The remaining words in DECO buffer can be used for
	* storing shared descriptor.
	*/
	#define MAX_SDLEN ((CAAM_DESC_BYTES_MAX - DESC_JOB_IO_LEN) / CAAM_CMD_SZ)

	/* Length of a single buffer in the QI driver memory cache */
	#define CAAM_QI_MEMCACHE_SIZE 768

	extern bool caam_congested __read_mostly;

	/*
	* This is the request structure the driver application should fill while
	* submitting a job to driver.
	*/
	struct caam_drv_req;

	/*
	* caam_qi_cbk - application's callback function invoked by the driver when the
	* request has been successfully processed.
	* @drv_req: original request that was submitted
	* @status: completion status of request (0 - success, non-zero - error code)
	*/
	typedef void (caam_qi_cbk)(struct caam_drv_req drv_req, u32 status);

	enum optype {
	ENCRYPT,
	DECRYPT,
	GIVENCRYPT,
	NUM_OP
	};

	/**
	* caam_drv_ctx - CAAM/QI backend driver context
	*
	* The jobs are processed by the driver against a driver context.
	* With every cryptographic context, a driver context is attached.
	* The driver context contains data for private use by driver.
	* For the applications, this is an opaque structure.
	*
	* @prehdr: preheader placed before shrd desc
	* @sh_desc: shared descriptor
	* @context_a: shared descriptor dma address
	* @req_fq: to-CAAM request frame queue
	* @rsp_fq: from-CAAM response frame queue
	* @cpu: cpu on which to receive CAAM response
	* @op_type: operation type
	* @qidev: device pointer for CAAM/QI backend
	*/
	struct caam_drv_ctx {
	u32 prehdr[2];
	u32 sh_desc[MAX_SDLEN];
	dma_addr_t context_a;
	struct qman_fq *req_fq;
	struct qman_fq *rsp_fq;
	int cpu;
	enum optype op_type;
	struct device *qidev;
	} ____cacheline_aligned;

	/**
	* caam_drv_req - The request structure the driver application should fill while
	* submitting a job to driver.
	* @fd_sgt: QMan S/G pointing to output (fd_sgt[0]) and input (fd_sgt[1])
	* buffers.
	* @cbk: callback function to invoke when job is completed
	* @app_ctx: arbitrary context attached with request by the application
	*
	* The fields mentioned below should not be used by application.
	* These are for private use by driver.
	*
	* @hdr__: linked list header to maintain list of outstanding requests to CAAM
	* @hwaddr: DMA address for the S/G table.
	*/
	struct caam_drv_req {
	struct qm_sg_entry fd_sgt[2];
	struct caam_drv_ctx *drv_ctx;
	caam_qi_cbk cbk;
	void *app_ctx;
	} ____cacheline_aligned;

	/**
	* caam_drv_ctx_init - Initialise a CAAM/QI driver context
	*
	* A CAAM/QI driver context must be attached with each cryptographic context.
	* This function allocates memory for CAAM/QI context and returns a handle to
	* the application. This handle must be submitted along with each enqueue
	* request to the driver by the application.
	*
	* @cpu: CPU where the application prefers to the driver to receive CAAM
	* responses. The request completion callback would be issued from this
	* CPU.
	* @sh_desc: shared descriptor pointer to be attached with CAAM/QI driver
	* context.
	*
	* Returns a driver context on success or negative error code on failure.
	*/
	struct caam_drv_ctx caam_drv_ctx_init(struct device qidev, int *cpu,
	u32 *sh_desc);

	/**
	* caam_qi_enqueue - Submit a request to QI backend driver.
	*
	* The request structure must be properly filled as described above.
	*
	* @qidev: device pointer for QI backend
	* @req: CAAM QI request structure
	*
	* Returns 0 on success or negative error code on failure.
	*/
	int caam_qi_enqueue(struct device qidev, struct caam_drv_req req);

	/**
	* caam_drv_ctx_busy - Check if there are too many jobs pending with CAAM
	* or too many CAAM responses are pending to be processed.
	* @drv_ctx: driver context for which job is to be submitted
	*
	* Returns caam congestion status 'true/false'
	*/
	bool caam_drv_ctx_busy(struct caam_drv_ctx *drv_ctx);

	/**
	* caam_drv_ctx_update - Update QI driver context
	*
	* Invoked when shared descriptor is required to be change in driver context.
	*
	* @drv_ctx: driver context to be updated
	* @sh_desc: new shared descriptor pointer to be updated in QI driver context
	*
	* Returns 0 on success or negative error code on failure.
	*/
	int caam_drv_ctx_update(struct caam_drv_ctx drv_ctx, u32 sh_desc);

	/**
	* caam_drv_ctx_rel - Release a QI driver context
	* @drv_ctx: context to be released
	*/
	void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx);

	int caam_qi_init(struct platform_device *pdev);
	int caam_qi_shutdown(struct device *dev);

	/**
	* qi_cache_alloc - Allocate buffers from CAAM-QI cache
	*
	* Invoked when a user of the CAAM-QI (i.e. caamalg-qi) needs data which has
	* to be allocated on the hotpath. Instead of using malloc, one can use the
	* services of the CAAM QI memory cache (backed by kmem_cache). The buffers
	* will have a size of 256B, which is sufficient for hosting 16 SG entries.
	*
	* @flags: flags that would be used for the equivalent malloc(..) call
	*
	* Returns a pointer to a retrieved buffer on success or NULL on failure.
	*/
	void *qi_cache_alloc(gfp_t flags);

	/**
	* qi_cache_free - Frees buffers allocated from CAAM-QI cache
	*
	* Invoked when a user of the CAAM-QI (i.e. caamalg-qi) no longer needs
	* the buffer previously allocated by a qi_cache_alloc call.
	* No checking is being done, the call is a passthrough call to
	* kmem_cache_free(...)
	*
	* @obj: object previously allocated using qi_cache_alloc()
	*/
	void qi_cache_free(void *obj);

	#endif /* __QI_H__ */